-er a-a a-c aaa aac aae aah aao aap aar aas ac- aca acc ace ach aco acp acr acs aea aec aee aeh aeo aep aer aes aha ahc ahe ahh aho ahp ahr ahs aoa aoc aoe aoh aoo aop aor aos ap- apa apc ape aph apo app apr aps ar- ara arc are arh aro arp arr ars as- asa asc ase ash aso asp asr ass c-- caa cac cae cah cao cap car cas cca ccc cce cch cco ccp ccr ccs ce- cea cec cee ceh ceo cep cer ces ch- cha chc che chh cho chp chr chs co- coa coc coe coh coo cop cor cos cpa cpc cpe cph cpo cpp cpr cps cra crc cre crh cro crp crr crs csa csc cse csh cso csp csr css eaa eac eae eah eao eap ear eas ec- eca ecc ece ech eco ecr ecs eea eec eee eeo eep eer ees eha ehc ehe ehh eho ehp ehr ehs eo- eoa eoc eoe eoh eoo eop eor eos ep- epa epc epe eph epo epp epr eps era erc ere erh ero erp err ers es- esa esc ese esh eso esp esr ess haa hac hae hah hao hap har has hca hcc hce hch hco hcp hcr hcs he- hea hec hee heh heo hep her hes hha hhc hhe hhh hho hhp hhr hhs hoa hoc hoe hoh hoo hop hor hos hpa hpc hpe hph hpo hpp hpr hps hr- hra hrc hre hrh hro hrp hrr hrs hsa hsc hse hsh hsp hsr hss oaa oac oae oah oao oap oar oas oc- oca occ och oco ocp ocr ocs oea oec oee oeh oeo oep oer oes oha ohc ohe ohh oho ohp ohr ohs oo- ooa ooc ooh ooo oop oor oos op- opa opc ope oph opo opp opr ops or- ora orc ore orh oro orp orr ors os- osa osc ose osh oso osp osr oss p-p paa pac pae pah pao pap par pas pca pcc pce pch pco pcp pcr pcs pea pec pee peh peo pep per pes pha phc phe pho php phr phs poa poc poe poh poo pop por pos ppa ppc ppe pph ppo ppp ppr pps pra prc pre prh pro prp prr prs ps- psa psc pse psh pso psp psr pss ra- raa rac rae rah rao rap rar ras rca rcc rce rch rco rcp rcr rcs re- rea rec ree reh reo rep rer res rh- rha rhc rhe rhh rho rhp rhr rhs roa roc roe roh roo rop ror ros rpa rpc rpe rph rpo rpp rpr rps rra rrc rrh rrp rrr rrs rsa rsc rse rsh rso rsp rsr rss saa sac sae sah sao sap sar sas sca scc sce sch sco scp scr scs se- sea sec see seh seo sep ser ses sh- sha shc she shh sho shp shr shs soa soc soe soh soo sop sor sos spa spc spe sph spo spp spr sps sr- sra src sre srh sro srp srr srs ss- ssa ssc sse ssh sso ssp ssr sss